I'm not really a gamer so can't answer your question directly, but it might help if you posted at least what CPU and graphics card you have .. people would probably be better placed to respond if they had that info

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Like anything, it will vary by game. Some things run better in Windows, some in Linux. In most cases, there's no difference that I've noticed. What you may want to do to test it is set up a dual boot with Windows for now and try out Steam on Peppermint. Yoiu can always make the change permanent if you like it. If not, you can always return to Windows without installing it again.

Another place to get info on how specific games run in Steam on Linux is the Steam discussions. Chances are, if you look at any specific game's board, someone has posted info good or bad about it.

I'm not really a gamer so can't answer your question directly, but it might help if you posted at least what CPU and graphics card you have .. people would probably be better placed to respond if they had that info

Like anything, it will vary by game. Some things run better in Windows, some in Linux. In most cases, there's no difference that I've noticed. What you may want to do to test it is set up a dual boot with Windows for now and try out Steam on Peppermint. Yoiu can always make the change permanent if you like it. If not, you can always return to Windows without installing it again.

Another place to get info on how specific games run in Steam on Linux is the Steam discussions. Chances are, if you look at any specific game's board, someone has posted info good or bad about it.

It really depends on whether the game is native DirectX or OpenGL. Games that are native OpenGL won't have to be as heavily modified to run in Linux and their performance should be roughly the same. Though, that can also depend on other factors, such as drivers. DirectX games have to be converted to and optimized to run on OpenGL. How well they do depends on who does the conversion and how good a job they do at it. When they were first talking about Steam for Linux, Valve was talking up their OpenGL conversions of their games, such as the Half-Live and Portal series. According to them, the test results showed improved performance on Linux with OpenGL over Windows with DirectX.

So, again, it all varies by game.

Another thing to factor in are games that aren't Linux compatible. If you have any of those, you have to install Wine and install a second version of Steam, the .exe version. You can't even download a game on Steam that's not compatible with your OS. And, again, some games will run well, others not so much. Wine has a notoriously bad history with Nvidia, whose products are the preferred choice of many Linux gamers. They tend to have better driver support, according to most gamers. That's especially true with Ubuntu 16.04, which Peppermint 7 will be based on. AMD hasn't even released FGLRX or Catalyst drivers for 16.04, so they're not in the repositories.